nightman

noun3

1. •
   A nightwatchman; a guard who works at night.
2. •
   (historical) A person whose job is cleaning cesspools or sewers, or emptying privies by night.

   • That the Laystalls be removed as far as may be out of the City, and common Passages, and that no Nightman or other be suffered to empty a Vault into any Garden near about the City. — 1722
3. •
   (old-fashioned) A male night shift worker.